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Model Misspecification and Underdiversification

  • Raman Uppal

    (London Business School and CEPR)

  • Tan Wang

    (University of British Columbia)

In this paper, we study intertemporal portfolio choice when an investor accounts explicitly for model misspecification. We develop a framework that allows for ambiguity about not just the joint distribution of returns for all stocks in the portfolio, but also for different levels of ambiguity for the marginal distribution of returns for "any" subset of these stocks. We find that when the overall ambiguity about the joint distribution of returns is high, then small differences in ambiguity for the marginal return distribution will result in a portfolio that is significantly underdiversified relative to the standard mean-variance portfolio. Copyright 2003 by the American Finance Association.

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Article provided by American Finance Association in its journal The Journal of Finance.

Volume (Year): 58 (2003)
Issue (Month): 6 (December)
Pages: 2465-2486

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Handle: RePEc:bla:jfinan:v:58:y:2003:i:6:p:2465-2486
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